Description

The FSD146MRBN is an integrated Pulse Width Modulation (PWM) controller and SenseFET designed for offline Switch-Mode Power Supplies (SMPS) with minimal external components. The PWM controller includes an integrated fixed-frequency oscillator, Under Voltage Lockout (UVLO), Leading-Edge Blanking (LEB), optimized gate driver, internal soft-start, temperature compensated precise current sources for loop compensation, and self-protection circuitry. Compared with a discrete MOSFET and PWM controller solution, the FSD146MRBN can reduce total cost, component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for cost-effective design of a flyback converter.

Features

■ Advanced Soft Burst-Mode Operation for

Low Standby Power and Low Audible Noise

■ Random Frequency Fluctuation for Low EMI

■ Pulse-by-Pulse Current Limit

■ Various Protection Functions: Overload Protection

(OLP), Over-Voltage Protection (OVP), Abnormal

Over-Current Protection (AOCP), Internal Thermal

Shutdown (TSD) with Hysteresis, Output-Short

Protection (OSP), and Under-Voltage Lockout

(UVLO) with Hysteresis

■ Low Operating Current (0.4mA) in Burst Mode

■ Internal Startup Circuit

■ Internal High-Voltage SenseFET: 650V

■ Built-in Soft-Start: 15ms

■ Auto-Restart Mode

Applications

■ Power Supply for LCD Monitor, STB, and DVD Combination